fae 
what more of cryftallized nitre; for-he thinks that 240 grs. 
of thefe cryftals lofe 2 of water when ignited, which fhews 
that his red heat was much milder than that applied by Mr. 
Bergman, and explains the difference of their refults when they 
followed in appearance the fame method of inveftigation, 
Since 100 parts pure alkali take up 116 of the ftrongeft 
nitrous acid, $3,5 take up 96,86, which are equivalent to 100,25 
of ftandard. This quantity of ftandard muft therefore have 
been contained in the 262 grs. of the fpirit of nitre employed 
by Mr. Wenzel in faturating 83,5 of pure alkali, whence it fol- 
lows that roo gts. of his fpirit of nitre contained 38,22 of my 
ftandard ; its fpecific gravity was then about 1,227 *. 
Mr. Wiegleb’s fuccefs was ftill more complete ; he found that 
112 gts. of nitre gently heated contained 52 of alkali and 60 
of the ftrongeft acid; and confequently roo grs. of nitre contain 
46,5 of alkali and 53,5 of acid nearly, which agrees almoft 
exactly with my determination. Hence 100 parts pure alkali 
fhould take up 115,4 of the ftrongeft acid and afford 215,4 of 
nitre. 
Salt of Sylvius or muriated Vegetable Alkali. 
To 360 grs. of the fildhon of fhild vegetable alkali, ftill 
further diluted by the addition of 518 grs. of water, I added {pirit 
Vor. IV. E of 
* His own conclufion is, that 240 grs. of his fpirit of nitre contain 82,5. of the 
ftrongeft acid of nitre, which are equivalent to 91,72 of my ftandard. 
